linux-kernel - [PATCH 1/2] kunit: add fallback for os.sched

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Message-Id: <20241025-kunit-qemu-accel-macos-v1-1-2f30c26192d4@gmail.com>
Date: Fri, 25 Oct 2024 17:03:53 -0400
From: Tamir Duberstein <tamird@...il.com>
To: Brendan Higgins <brendan.higgins@...ux.dev>, 
 David Gow <davidgow@...gle.com>, Rae Moar <rmoar@...gle.com>
Cc: linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, 
 linux-kernel@...r.kernel.org, Tamir Duberstein <tamird@...il.com>
Subject: [PATCH 1/2] kunit: add fallback for os.sched_getaffinity

Python 3.13 added os.process_cpu_count as a cross-platform alternative
for the Linux-only os.sched_getaffinity. Use it when it's available and
provide a fallback when it's not.

This allows kunit to run on macOS.

Signed-off-by: Tamir Duberstein <tamird@...il.com>
---
 tools/testing/kunit/kunit.py | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
index bc74088c458aee20b1a21fdeb9f3cb01ab20fec4..3a8cbb868ac559f68d047e38be92f7c64a3314ea 100755
--- a/tools/testing/kunit/kunit.py
+++ b/tools/testing/kunit/kunit.py
@@ -303,7 +303,16 @@ def massage_argv(argv: Sequence[str]) -> Sequence[str]:
 	return list(map(massage_arg, argv))
 
 def get_default_jobs() -> int:
-	return len(os.sched_getaffinity(0))
+	if sys.version_info >= (3, 13):
+		if (ncpu := os.process_cpu_count()) is not None:
+			return ncpu
+		raise RuntimeError("os.process_cpu_count() returned None")
+	 # See https://github.com/python/cpython/blob/b61fece/Lib/os.py#L1175-L1186.
+	if sys.platform != "darwin":
+		return len(os.sched_getaffinity(0))
+	if (ncpu := os.cpu_count()) is not None:
+		return ncpu
+	raise RuntimeError("os.cpu_count() returned None")
 
 def add_common_opts(parser: argparse.ArgumentParser) -> None:
 	parser.add_argument('--build_dir',

-- 
2.47.0